Optical cable is usually placed in a 25 to 40 mm inside diameter (ID) sub-duct which is placed into an existing larger diameter communications conduit. Most communications conduits can be fitted with three or four sub-ducts. Sub-ducts are often referred to as innerducts. 2 meters (3-4 feet) deep to reduce the likelihood of accidentally being dug up. In extreme cold climates, cables may need to be buried at greater depths where there temperatures are colder and frost penetrates to. Placing cables underground has the added benefits of reducing transmission losses, aiding planning consent and reduced risk of service supply loss through extreme weather. Underground cable is. The Fiber Optic Association, Inc. The charter of the FOA was to promote professionalism in fiber optics through education, certification, and. This section describes providing conduit for ITS work and providing permanent flexible above ground markers along a path of any fiber optic cabling and new or existing manholes. Furnish orange, smooth, high-density polyethylene (HDPE), solid-wall conduit rated for outdoor and underground use. Duraline Smooth Wall HDPE Innerduct Conduit All Dura-Line's smooth wall conduit meets or exceeds one or more of the following standards: ASTM F-2160, ASTM D-3035, ASTM D-2239, ASTM D-3485, NEMA TC-7, UL 651, UL 1990, Bellcore GR-356 Features: Can be. Schedule 40, Schedule 80, SDR 13. The maximum pulling tension for stranded loose tube cable and ribbon cable is 600 lbF (2,700 Newtons).
